Results 41 to 50 of about 16,578 (144)

Geochemistry of the alkaline volcanicsubvolcanic rocks of the Fernando de Noronha Archipelago, southern Atlantic Ocean

Brazilian Journal of Geology
The Fernando de Noronha Archipelago presents, on its main island, a centrally-located stratigraphic unit, the Remédios Formation (age around 8 - 12 Ma) constituted by basal pyroclastic rocks intruded by dikes, plugs and domes of varied igneous rocks ...
Rosana Peporine Lopes, Mabel Norma Costas Ulbrich   +1 more
doaj   +1 more source

Secular Variation in the North American Kimberlite Formation: The Variable Connection to LLSVPs

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 10, October 2025.
Abstract Kimberlites are rare and perplexing igneous rocks that may represent the deepest‐sourced melt type extracted from within the Earth's mantle, and their origin may be associated with Large Low Shear Velocity Provinces (LLSVPs) along the core‐mantle boundary.
C. Adam, P. D. Kempton
wiley   +1 more source

Thermo‐Mechanical Rift Evolution of Large Igneous Province Crust

Tectonics, Volume 44, Issue 9, September 2025.
Abstract Numerical models, coupled with observational data, have proven crucial for addressing fundamental questions regarding extensional processes from continental rift to mid‐ocean ridge (MOR). However, extensional processes at Large Igneous Provinces (LIP), a distinct type of lithosphere, have not been examined, leaving a thorough comprehension of ...
L. Magri, D. Neuharth, S. Williams, S. Brune, J. M. Whittaker, D. Sandiford, M. F. Coffin, K. Hochmuth, A. Glerum   +8 more
wiley   +1 more source

Genesis of Ultramafic Lamprophyres and Carbonatites at Aillik Bay, Labrador: a Consequence of Incipient Lithospheric Thinning beneath the North Atlantic Craton [PDF]

, 2006
Numerous dykes of ultramafic lamprophyre (aillikite, mela-aillikite, damtjernite) and subordinate dolomite-bearing carbonatite with U-Pb perovskite emplacement ages of similar to 590-555 Ma occur in the vicinity of Aillik Bay, coastal Labrador.
SEBASTIAN TAPPE, Kjarsgaard, B. A., Foley, Stephen F., LARRY M. HEAMAN, Tappe, S., ROLF L. ROMER, Romer, Rolf L., Heaman, L. M., JOCHEN HOEFS, STEPHEN F. FOLEY, BRUCE A. KJARSGAARD, Jenner, G. A., ANDREAS STRACKE, Stracke, A., GEORGE A. JENNER, Joyce, N., Hoefs, Jochen, NANCY JOYCE   +17 more
core   +1 more source

Metasomatism and Melting of Cordilleran Lithosphere Resulting From Sediment Relamination During Shallow Subduction

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract Mantle xenoliths recovered from the modern backarc region of the northern Altiplano Plateau record metasomatism by slab‐derived silicic melts, and a suite of Quaternary volcanics suggest that melting of accreted crustal material has persisted since shallow subduction in the Oligocene.
C. D. Hiett, D. L. Newell, J. W. Shervais   +2 more
wiley   +1 more source

Thickening Cratonic Lithosphere by Horizontal Compression in the Presence of Surface Erosion and Sedimentation

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 6, June 2025.
Abstract Here we examine how lithospheric thickening is affected by active surface sedimentation and erosion in geodynamic models of craton formation—an aspect that has been neglected in previous models even though cratons may be the first landmasses to emerge above sea level.
Kristina Kublik, Claire A. Currie, D. Graham Pearson   +2 more
wiley   +1 more source

Cenozoic Vertically‐tearing of Indian Slab Modified the Asian Lithosphere beneath the Eastern Tibetan Plateau

Acta Geologica Sinica - English Edition, Volume 99, Issue 3, Page 627-633, June 2025.
Abstract A subducted continental slab is sometimes torn during collision, yet the exact impact of slab‐tearing on the overlying lithosphere remains unclear. Here, we image the structure and architecture of the Asian lithosphere above the Indian slab in the eastern Tibetan Plateau using multiscale seismic tomography models and zircon Hf isotopic mapping,
Zengqian HOU, Bo XU, Tiannan YANG, Haijiang ZHANG, Nian YU, Yi ZHAO, Zhuang MIAO   +6 more
wiley   +1 more source

Kimberlite, lamproite, ultramafic lamprophyre, carbonatite relationships on the Dharwar Craton, India; an example from the Khaderpet pipe, a diamondiferous ultramafic with associated carbonatite intrusion

, 2013
Are kimberlites, lamproites, ultramafic lamprophyres and carbonatites genetically associated or not? There are strong opinions for and against any relationship.
Chatterjee, B., Beard, Andrew D., Smith, C.B., Townend, R., Haggerty, S.E., Beard, Andy   +5 more
core   +1 more source

The Protolith of the Carbonate Rich Rocks of the Larder Lake Break [PDF]

, 1979
Title: The Protolith of the Carbonate Rich Rocks of the Larder Lake Break, Author: George M. Werniuk, Location: ThodeThe rocks of the Larder Lake Break at the Misema River road cut are predominantly schists, green carbonates, porphyries, lamprophyres ...
Werniuk, George M.
core   +1 more source

Trans‐Crustal Geophysical Responses Beneath the Supergiant Timmins‐Porcupine Orogenic Gold Camp, Canada

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 3, March 2025.
Abstract A new 80‐site magnetotelluric (MT) survey, integrated with reprocessed seismic reflection profiles, across the supergiant Timmins‐Porcupine gold camp of the Abitibi greenstone belt (AGB) was conducted to investigate the architecture of crustal‐scale structures.
A. Q. Adetunji, I. J. Ferguson, J. M. Simmons, C. Ma, S. Cheraghi, D. B. Snyder, J. A. Ayer   +6 more
wiley   +1 more source